Bayesian mass and age estimates for transiting exoplanet host stars⋆
... In cases where asymmetric error bars are quoted on values we use either the upper or lower error bar, as appropriate, depending on whether the model value is greater than or less than the observed value. The probability distribution function p(m) = p(τ ) p(M ) p([Fe/H]i ) is the product of the ind ...
... In cases where asymmetric error bars are quoted on values we use either the upper or lower error bar, as appropriate, depending on whether the model value is greater than or less than the observed value. The probability distribution function p(m) = p(τ ) p(M ) p([Fe/H]i ) is the product of the ind ...
Title: Binary interaction dominates the evolution of massive stars
... We find an intrinsic binary fraction of fbin = 0.69 ± 0.09, a strong preference for close pairs (π = -0.55 ± 0.2) and a uniform distribution of the mass ratio (κ = -0.1 ± 0.6) for binaries with periods up to about nine years. Comparison of the intrinsic, simulated and observed cumulative distributio ...
... We find an intrinsic binary fraction of fbin = 0.69 ± 0.09, a strong preference for close pairs (π = -0.55 ± 0.2) and a uniform distribution of the mass ratio (κ = -0.1 ± 0.6) for binaries with periods up to about nine years. Comparison of the intrinsic, simulated and observed cumulative distributio ...
docx - STAO
... Students could use their astrolabes to collect data observing the change in position of the Moon, Polaris, and other celestial objects in the night sky. Depending on the season you could direct students to observe specific celestial objects, e.g., Jupiter, Betelgeuse, other stars of Orion in the win ...
... Students could use their astrolabes to collect data observing the change in position of the Moon, Polaris, and other celestial objects in the night sky. Depending on the season you could direct students to observe specific celestial objects, e.g., Jupiter, Betelgeuse, other stars of Orion in the win ...
An introduction to photometry and photometric measurements Henry
... "brightness" of the Sun appears to be about the same over most of the Sun's surface, which looks like a nearly uniform disk even though it is a sphere. This means, for example, that a photograph of the Sun would expose the film equally across the Sun's disk. It also turns out that the exposure would ...
... "brightness" of the Sun appears to be about the same over most of the Sun's surface, which looks like a nearly uniform disk even though it is a sphere. This means, for example, that a photograph of the Sun would expose the film equally across the Sun's disk. It also turns out that the exposure would ...
KS1 Education Guide - Immersive Theatres
... (From the Merriam-Webster Dictionary) Average – (adjective) being about midway between extremes, not out of the ordinary: Common Planet – any of the large bodies that revolve around the sun in the solar system Star – a: a natural luminous body visible in the sky especially at night b: a self-luminou ...
... (From the Merriam-Webster Dictionary) Average – (adjective) being about midway between extremes, not out of the ordinary: Common Planet – any of the large bodies that revolve around the sun in the solar system Star – a: a natural luminous body visible in the sky especially at night b: a self-luminou ...
Astronomy Assignment #1
... declinations of +87, -40, and -67. Which of these objects can you observe? This question requires a fairly complete understanding of the celestial coordinate system and the celestial sphere model. According to the last sentence on page 43 “if a star’s declination matches your latitude it will pas ...
... declinations of +87, -40, and -67. Which of these objects can you observe? This question requires a fairly complete understanding of the celestial coordinate system and the celestial sphere model. According to the last sentence on page 43 “if a star’s declination matches your latitude it will pas ...
Interpretation of the Helix Planetary Nebula using Hydro
... planets that dominate the interstellar medium. A gentle rain of JPP comets on the central stars of PNes permits the possibility that any WD may slowly grow its carbon core to the Chandrasekhar limit. As the carbon core mass grows, its density and angular momentum increase along with the strength of ...
... planets that dominate the interstellar medium. A gentle rain of JPP comets on the central stars of PNes permits the possibility that any WD may slowly grow its carbon core to the Chandrasekhar limit. As the carbon core mass grows, its density and angular momentum increase along with the strength of ...
b. - UW Canvas
... dependence of the parallax angle on the distance an object is from Earth. If the minimum parallax angle we could measure were 0.5 arcsec, what is the maximum distance of a star that we could measure? ...
... dependence of the parallax angle on the distance an object is from Earth. If the minimum parallax angle we could measure were 0.5 arcsec, what is the maximum distance of a star that we could measure? ...
Astronomy Astrophysics NGC 7419 as a template for red supergiant clusters &
... natural environment. In addition, most massive stars are found in open clusters, because their short lifetimes prevent them from drifting into the field. Unfortunately, the most massive (and interesting) clusters are usually affected by very heavy foreground extinction, which makes it difficult and ver ...
... natural environment. In addition, most massive stars are found in open clusters, because their short lifetimes prevent them from drifting into the field. Unfortunately, the most massive (and interesting) clusters are usually affected by very heavy foreground extinction, which makes it difficult and ver ...
Alpha Centauri
... Alpha Centauri Was often called Rigel Kentaurus. Rigel Kentaurus means “foot of the centaur” in Arabic. ...
... Alpha Centauri Was often called Rigel Kentaurus. Rigel Kentaurus means “foot of the centaur” in Arabic. ...
D ASTROPHYSICS
... A galaxy is a creation of stars, gas, and dust held together by gravity and containing billions of stars. The Milky Way contains about 3 × 10 11 stars and, probably, at least this number of planets. Some galaxies exist in isolation but the majority of them occur in groups known as clusters that have ...
... A galaxy is a creation of stars, gas, and dust held together by gravity and containing billions of stars. The Milky Way contains about 3 × 10 11 stars and, probably, at least this number of planets. Some galaxies exist in isolation but the majority of them occur in groups known as clusters that have ...
Constraints on the Birth Aggregate of the Solar System
... the binary orbit, the asymptotic incoming velocity vinf of the solar system with respect to the center of mass of the binary, the angles θ, ψ, and φ which describe the impact direction and orientation, and finally the impact parameter h of the collision. Additional (intrinsic) parameters are require ...
... the binary orbit, the asymptotic incoming velocity vinf of the solar system with respect to the center of mass of the binary, the angles θ, ψ, and φ which describe the impact direction and orientation, and finally the impact parameter h of the collision. Additional (intrinsic) parameters are require ...
3.2 Spectra and Spectral Classification
... (a) absolute magnitude or luminosity and (b) spectral type or effective temperature (sometimes also color index) That means there exist different forms of this diagram, usually ● log L versus spectral type ● log L versus log T ● M versus B-V ...
... (a) absolute magnitude or luminosity and (b) spectral type or effective temperature (sometimes also color index) That means there exist different forms of this diagram, usually ● log L versus spectral type ● log L versus log T ● M versus B-V ...
The Next Great Exoplanet Hunt Please share
... probability for transits is equal to the stellar diameter divided by the orbital diameter, which is only 0.1% for an Earth-like orbit around a Sun-like star. For this reason, a meaningful transit survey must include tens of thousands of stars, or more. Because faint stars far outnumber bright ones i ...
... probability for transits is equal to the stellar diameter divided by the orbital diameter, which is only 0.1% for an Earth-like orbit around a Sun-like star. For this reason, a meaningful transit survey must include tens of thousands of stars, or more. Because faint stars far outnumber bright ones i ...
arXiv:astro-ph/0508448v1 22 Aug 2005
... notable that, in all five of the Galactic WC+O systems with measured masses, the WC star (which is a stripped core nearing the very end of its lifetime) is more massive than 8 M⊙ . These systems also have massive O star companions (23 – 34 M⊙ , van der Hucht 2001) which will quite probably still be ...
... notable that, in all five of the Galactic WC+O systems with measured masses, the WC star (which is a stripped core nearing the very end of its lifetime) is more massive than 8 M⊙ . These systems also have massive O star companions (23 – 34 M⊙ , van der Hucht 2001) which will quite probably still be ...
Jura et al. 2004 - Department of Physics and Astronomy
... We report spectra obtained with the Spitzer Space Telescope in the λ = 14 – 35 µm range of 19 nearby main-sequence stars with infrared excesses. The six stars with strong dust emission show no recognizable spectral features, suggesting that the bulk of the emitting particles have diameters larger th ...
... We report spectra obtained with the Spitzer Space Telescope in the λ = 14 – 35 µm range of 19 nearby main-sequence stars with infrared excesses. The six stars with strong dust emission show no recognizable spectral features, suggesting that the bulk of the emitting particles have diameters larger th ...
Cygnus (constellation)
Cygnus /ˈsɪɡnəs/ is a northern constellation lying on the plane of the Milky Way, deriving its name from the Latinized Greek word for swan. The swan is one of the most recognizable constellations of the northern summer and autumn, it features a prominent asterism known as the Northern Cross (in contrast to the Southern Cross). Cygnus was among the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations.Cygnus contains Deneb, one of the brightest stars in the night sky and one corner of the Summer Triangle, as well as some notable X-ray sources and the giant stellar association of Cygnus OB2. One of the stars of this association, NML Cygni, is one of the largest stars currently known. The constellation is also home to Cygnus X-1, a distant X-ray binary containing a supergiant and unseen massive companion that was the first object widely held to be a black hole. Many star systems in Cygnus have known planets as a result of the Kepler Mission observing one patch of the sky, the patch is the area around Cygnus. In addition, most of the eastern part of Cygnus is dominated by the Hercules–Corona Borealis Great Wall, a giant galaxy filament that is the largest known structure in the observable universe; covering most of the northern sky.